I CAN`T IMAGINE a journey of a thousand miles beginning with a thousand-mile step. When you say a single step, it is a very small beginning compared to the length of a journey that Lao Tzu is trying to tell or impress in this quotation.
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The Book of Proverbs

his also contains the proverbs of Solomon, like the revelation of the truth about life, the advice of the mother queen to the young king, and the reflection of an ideal husband in a known man.

The book of Proverbs is believed to have been written by Agur, Lemuel and Solomon in 716 BC.